479 citations · 629 across the 7 of their papers we have counts for
7 papers
Spontaneous symmetry breaking without ground state degeneracy in generalized -state clock model
Yaozong Hu, Haruki Watanabe
Spontaneous symmetry breaking is ubiquitous phenomenon in nature. One of the defining features of symmetry broken phases is that the large system size limit and the vanishing exter…
Topological Crystalline Magnets: Symmetry-Protected Topological Phases of Fermions
Haruki Watanabe, Liang Fu
We introduce a novel class of interaction-enabled topological crystalline insulators in two- and three-dimensional electronic systems, which we call "topological crystalline magnet…
Energy gap of neutral excitations implies vanishing charge susceptibility
Haruki Watanabe
In quantum many-body systems with a U(1) symmetry, such as the particle number conservation and the axial spin conservation, there are two distinct types of excitations: charge-neu…
Absence of Quantum Time Crystals
Haruki Watanabe, Masaki Oshikawa
In analogy with crystalline solids around us, Wilczek recently proposed the idea of "time crystals" as phases that spontaneously break the continuous time translation into a discre…
Englert-Brout-Higgs Mechanism in Nonrelativistic Systems
Haruki Watanabe, Hitoshi Murayama
We study the general theory of Englert-Brout-Higgs mechanism without assuming Lorentz invariance. In the presence of a finite expectation value of non-Abelian matter charges, gaugi…
Nambu-Goldstone bosons with fractional-power dispersion relations
Haruki Watanabe, Hitoshi Murayama
We pin down the origin of a peculiar dispersion relation of domain wall fluctuation, the so-called ripplon, in a superfluid-superfluid interface. A ripplon has a dispersion relatio…